The dynamics of virulence of Omsk population of Puccinia triticina

The analysis of the virulence of Puccinia triticina en-tries collected in Omsk Region in 2017 was performed. The genes Lr19, Lr24, Lr28, Lr29, Lr41, Lr42, Lr45, Lr47, Lr51, Lr53 and Lr65 are characterized by high efficiency. The variation in the frequencies of virulence was observed on the lines TcLr2a, TcLr9, TcLrll, TcLr15, TcLr16, TcLr20 and TcLr26. In general, there were significant changes in Omsk population in 2013-2017. Basically, significant changes in Omsk population in 2013-2017 affected the frequency of occurrence of clones virulent to wheat lines with resistance genes Lr9 (10-33 %), Lr20 (37-100 %) and Lr26 (0-69 %). 61 studied monopustuline isolates were represented by 12 phenotypes (races). Among them, three THTTR (avirulence / virulence: TcLr9, 19, 24 / 1, 2a, 2b, 2c, 3a, 3bg, 3ka, 11, 14a, 14b, 15, 16, 17, 18, 20, 26, 30), TGTTR (TcLr9, 19, 24, 26 / 1, 2a, 2b, 2c, 3a, 3bg, 3ka, 11,14a, 14b, 15, 16, 17, 18, 20, 30) and TQTTR (TcLr19, 24, 26 / 1, 2a, 2b, 2c, 3a, 3bg, 3ka, 9, 11, 14a, 14b, 15, 16, 17, 18, 20, 30) had the largest representa-tion in Omsk population in 2013-2017...